Bio-medical electrode conductive gel pads
Patent 3998215 Issued on December 21, 1976. Estimated Expiration Date: 
December 21, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 21, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorsApplicationNo. 136768 filed on 04/23/1971US Classes:600/397, Electrolyte containing600/391, Adhesive600/394Head and socket connector for attaching lead to electrodeExaminersPrimary: Howell, Kyle L.Attorney, Agent or FirmInternational ClassA61B 5/0408 (20060101)ClaimsWhat is claimed is:1. An electrically conductive pad conformable to the surface of the human body and adapted to facilitate the transfer of electrical signals between the body and an electrode,comprising a porous, fibrous carrier having a lightly adherent, conductive hydrogel carried thereby, said hydrogel impregnating and surfacing both sides of said carrier and said hydrogel being more cohesive to said hydrogel than adhesive to the surfaceof the human body to enable residue-free removal from the skin. 2. The pad of claim 1 wherein said porous, fibrous carrier is a fabric carrier having a substantially porous matrix. 3. The pad of claim 2 wherein said fabric carrier is an absorbent, non-woven fabric. 4. The pad of claim 1 wherein said hydrogel comprises a mixture of water, polyvinyl alcohol, sodium borate decahydrate and a fungicide, said water being present in a concentration of at least about 70% by weight. 5. The pad of claim 1 wherein said carrier has a porosity of from about 300 cc. of air in 0.1 to 50 seconds as measured on a Gurley Densometer and a volume resistivity of from about 5 ohm-cm to 50,000 ohm-cm. 6. The pad of claim 5 wherein said hydrogel comprises a mixture of water, polyvinyl alcohol, sodium borate decahydrate and a fungicide, said water being present in a concentration of at least about 70% by weight. 7. The pad of claim 5 wherein said fibers are rayon fibers. 8. An electrically conductive pad conformable to the surface of the human body and adapted to facilitate the transfer of electrical signals between said body and an electrode, comprising a thin layer of a reinforced, lightly adherent, conductivehydrogel reinforced with from about 0.5 to 10% by weight of a fibrous material, said hydrogel being available for contact with the skin on at least two sides, said hydrogel being more cohesive to said hydrogel than adhesive to the surface of the humanbody to enable residue-free removal from the skin. |
